Two friends A and B were employed to do work. The initial deadline was fixed…
2025
Two friends A and B were employed to do work. The initial deadline was fixed at 24 days. Both started working together but after 20 days, A left the work and the whole work took 30 days to complete. In how much time can B alone can do the work?
- A.
40
- B.
50
- C.
60
- D.
70
Attempted by 23 students.
Show answer & explanation
Correct answer: C
Answer:
60
Explanation:
Let the total work be 24 units. It is given that A and B together can do the work in 24 days.
=> Combined efficiency of A and B = 24/24 = 1 unit / day
=> Work done in 20 days = 20 units
=> Work left = 24 – 20 = 4 units
Now, this remaining 4 units of work was done by B alone in 10 days.
=> Efficiency of B = 4/10 = 0.4
Therefore, time required by B alone to do the work = 24/0.4 = 60 days